By Wilf R. Lalonde, John R. Pugh
A quantity consultant to object-oriented programming that provides the smalltalk approach as a strong and effective prototyping and improvement atmosphere. quantity describes the Smalltalk sessions that offer the commonly used overlapping home windows, pop-up menus, and mouse interplay facility that characterizes the Smalltalk person interface. It additionally covers the model-view controller framework for the development of person interfaces. It gains the version view-controller paradigm for window-based functions, and information person periods, together with relationships among comparable periods and layout rationales. The ebook is written for use in parallel with the Smalltalk method.
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Extra resources for Inside Smalltalk Vol 2
5 Window Management Versus Process Management During an interactive session, users generally manipulate many windows. They may interact with one window for a while, then switch to another for a short time, and finally switch back. A window may pop up as a consequence of some user-initiated action and wait for a specific response. Once provided, the window may disappear and the previous window regains control. , only one window actually executing. The others, the inactive windows, are held in abeyance waiting for a tum at becoming the active window.
ADelay wait Suspends the active process for the amount of time specified by the delay. aDelay disable Ensures that the delay can no longer be enabled. Example Suppose that we want to work for one hour and we would like a reminder at the end of that time period. Additionally, suppose it is early morning and we need to be reminded of lunch at noon. " wait. "When execution resumes, we will execute the following:" 10 timesRepeat: [Transcript show: 'One hour is up!! " theOneHourReminderBlock forkAt: (Processor activePriority + 1).
A would be turned on => a changed message is sent to A (to itself) => an update: message is sent to B (and all other dependents; A, in particular, is not a dependent of itself) => B is turned off => a c~langed message is sent to B (to itself) => an lJpdate: message is sent to A and all other dependents of B => A is turned off (this causes another change,j message to be sent with another round of updates: messages; this time all lights are off, so turning it off has no effect). 22 Inside Smalltalk Although we want the act of turning on A to cause B to turn off, we don't want the act of turning off B to cause A in turn to be turned off.